1978 riviera rear end Advice ????

78 riviera rear wheel drive 15inch tires have a bad rear end any 1 know of an exact replace ment that I can use cant find another 78 rivi around here have a sponsor a salvage yard so there is a bunch of other GM`s there but his cross reference book does not even show the 78 rivi and right now there about 10 inches of water so I cant get under to look for a same shape rear end cover any help please thanks Tee Shot #39 led sled at Auto City Speedway Clio MI :beer o No:

 

I think you would be better off asking this in another part of this forum.

 

for sure